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Related Concept Videos

Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
The first step is the preparation period, during which nucleus A is excited with a radiofrequency pulse.
Newman Projections02:06

Newman Projections

Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
2D NMR: Overview of Homonuclear Correlation Techniques01:16

2D NMR: Overview of Homonuclear Correlation Techniques

Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
COSY90 is the standard two-dimensional (2D) COSY experiment that...

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Related Experiment Video

Updated: Jul 6, 2026

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Two-dimensional graphene nanoribbons.

Xiaoyin Yang1, Xi Dou, Ali Rouhanipour

  • 1Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.

Journal of the American Chemical Society
|March 8, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to synthesize linear two-dimensional graphene nanoribbons up to 12 nm. These novel graphene nanoribbons exhibit a strong self-assembly behavior, confirmed by mass spectrometry and microscopy.

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Published on: November 12, 2014

Area of Science:

  • Materials Science
  • Nanotechnology
  • Organic Chemistry

Background:

  • Graphene nanoribbons (GNRs) are promising materials for advanced electronic and optical applications.
  • The precise synthesis of well-defined GNRs with controlled dimensions remains a significant challenge.
  • Exploring new synthetic routes is crucial for unlocking the full potential of GNRs.

Purpose of the Study:

  • To establish a novel synthetic strategy for producing linear two-dimensional graphene nanoribbons.
  • To synthesize GNRs with controlled lengths up to 12 nm.
  • To investigate the self-assembly characteristics of the newly synthesized GNRs.

Main Methods:

  • A new synthetic strategy was developed for GNR synthesis.
  • Characterization techniques included Mass Spectrometry (MS), UV/Vis spectroscopy, and Scanning Tunneling Microscopy (STM).
  • Microscopic studies were employed to analyze the structural properties and self-assembly behavior.

Main Results:

  • Successfully synthesized novel linear two-dimensional graphene nanoribbons with lengths up to 12 nm.
  • Characterization confirmed the structure and properties of the synthesized GNRs.
  • Microscopic analysis revealed a high tendency for these novel nanoribbons to self-assemble.

Conclusions:

  • A viable synthetic pathway for producing extended linear 2D graphene nanoribbons has been established.
  • The synthesized graphene nanoribbons possess unique self-assembly properties.
  • This work opens avenues for the controlled fabrication of nanoribbon-based materials and devices.